Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08aebce56965fe8…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 04:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e7a33ef872b55718ec4f94ab78ada0e SHA-1: 2ac1ab36bd9c4b95e49ac620d2209a05899e527f SHA-256: e08aebce56965fe8f1b74f24804b3025344dfdc472512ff74fcd25b523b14278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised WordPress installations and disposable hosting, suggesting it functions as a link farm or redirector to phishing or malware distribution sites. The embedded content, though heavily obfuscated, likely facilitates these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=equitable+quality+education PDF link annotation
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9340508bff45a4ab2a25016a2a8a0d40/48920933254.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e0cab22d---59101313480.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/silirigapapasofog.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ac7774f49dc10627fe7fcad613e236fa/73716800870.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qp5eg4mn727o6m3tp6fd9c2b66/89445274556.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9a4d416fa04d102013b70f1a7df83a5f/33881733237.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kurulivawudivezusi.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/46840984919.pdfIn PDF document text
    • http://ozari-ua.com/files/file/40261674712.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b85134cb5bd---wegivaliput.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072903062955---66548040639.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/17292324994.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/60867100918.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dff0a38849c6ac73a542a42c2bfa913c/1255869294.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bf8482768db8aaf34d55c2b25894f53e/77703103674.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nadadifa.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/63375957821.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/boxaluxuvetijajisixoti.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94a43b7188---bonebomanovagajasuxikexud.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/mebokaxadolujoterif.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71917978760.pdfIn PDF document text
    • https://funke.be/data/file/gemixowirafumegarakebom.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/011430252674.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/06hbkl7pg0jn6ullasua8r8sse/95980994865.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 18056 bytes
SHA-256: c95295af4e4f7e9129c561e051116b6ab52eb2a976e7a2529f48bce0979765f7
font_01_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 10580 bytes
SHA-256: b492314350e6b85b5f18927837fe641c5fecb34e089acb9108f79c6deb6f7ef9

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